Malicious PDF — malware analysis report

Static analysis result for SHA-256 6011f07a7387d0d8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 19:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 855dcccd2a8a1bec376060a3c413c8be SHA-1: c8688e0123fff51d1967a43496bcc8de4f323b69 SHA-256: 6011f07a7387d0d8569c3a959fae4db9e7548595b79dc73abeb04c2cbd33c53c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs and a heuristic firing for a 'link farm' on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seltec.io/images/uploads/files/tosepisopotoxabu.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910233554.pdf
    • https://jamuiboe.com/webroot/upload_media/saxarogib.pdf
    • http://uslugi-ogrodnicze.pl/pliki/File/xabimovokozigo.pdf
    • http://www.moyekolodin.com/files/9399730107.pdf
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/40324505301.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/67947346279.pdf
    • http://wsp.pl/userfiles/file/bibigonivurevutilisurid.pdf
    • http://josquin-capella.de/download/33185440957.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/ganajironepukinedokule.pdf
    • http://annamsaigonlaw.com/upload/files/gawofodetokigufudezozupog.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356fee306d5---vobobelapesabom.pdf
    • https://irrisyst.eu/files/file/folezit.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/03acee26a338ffacff7677ae60250864/59303009470.pdf
    • http://stauarchitetti.eu/userfiles/files/xenumexexefivewomanujoz.pdf
    • http://bfcy88.com/uploads/files/32531409992.pdf
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/mulorulogaxikitiz.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/77533626183.pdf
    • http://umhouses.com/uploads/files/26691259898.pdf
    • http://dcbestwings.com/uploads/files/84299013355.pdf
    • http://stonestudio.pl/files/upload/file/modina.pdf
    • https://keongracun.org/contents/files/88422442316.pdf
    • http://suriyedostlukdernegi.org/image/files/liwoniredavixokewe.pdf
    • http://ydchem.cn/filespath/files/20210903082258.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=campbell+biology+10th+edition+pdf+download+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 16792 bytes
font_01_sfnt_off0000f628.bin
38fb2982cec05d66e24791f0a8ff3ee51ff94b32fe75d3ce2c5a4f832a090647
pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 19376 bytes
font_02_sfnt_off00012917.bin
fe4292bd70c565df7330d2619b0e2f3dfb984f461b8f3e41c43b294b0f70d2fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 11324 bytes